The pictures below show the bone structures of three different animals.

the similarity in structure of the bones of these animals suggest:

group of answer choices

the size of the bones is the same

these species share a common ancestor

these species developed at the same time and location

the chemical makeup of these animals is exactly the same

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question 26.6 pts
which of the following is not true about natural selection?
group of answer choices

it results in adaptations that improve an organism's chance of survival

it ensures that only the biggest and strongest organisms survive

it depends on both inheritance and variation

it explains how environments affect which organisms live and reproduce

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question 36.7 pts
a structure that seems to serve no purpose in an organism is called:
group of answer choices

homologous

dichotomous

vestigial

fossilized

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question 46.7 pts
a population of bacteria is treated with hand sanitizer. because of genetic variation in the population, what is the possible outcome?
group of answer choices

there will be no change in the bacteria.

some of the bacteria may be resistant and survive.

the population will grow quickly

all of the bacteria will double in size

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question 56.6 pts
which of the following does not increase genetic variation?
group of answer choices

mutations

gene flow

mitosis

crossing over

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question 66.7 pts
which of the following is not an example of evolution?
group of answer choices

a caterpillar changing into a butterfly

horses becoming taller and faster over millions of years

humans brains becoming larger over time

all species of tortoises in the galapagos islands descending from a common ancestor.

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question 76.6 pts
a feature that allows an organism to better survive in its environment is a(n):
group of answer choices

variation

adaptation

dna molecule

fitness

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question 86.7 pts
genes for traits that an organism be more reproductively successful can be expected to:
group of answer choices

cause it to evolve into a new species

eventually be eliminated by natural selection

become more common in the future

cause the extinction of the species

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question 96.7 pts
scientists can explore whether two different animal species have evolved from a common ancestor, using evidence from all of the sources below except:
group of answer choices

analysis of strands of dna

studies of embryos during development

comparison of bones and muscles

comparison of experiences from each organism

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question 106.7 pts
how can geography lead to reproductive isolation?
group of answer choices

subspecies may choose to occupy different areas for competitive reasons

a physical barrier may arise and separate a population, preventing interbreeding

some populations may have a milder habitat than other populations

extremes of temperatures may reduce the breeding opportunities for some

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question 116.6 pts
which of these scenarios is an example of natural selection?
group of answer choices

people kill rattlesnakes that rattle when approached by humans, but people do not kill rattlesnakes that remain silent. the quiet snakes survive and breed

dogs that have a desirable coat color are bred with one another to produce puppies with the same coat color

giraffes that have longer necks survive a dry season by eating leaves from the tops of trees. those giraffes breed more successfully that year

farmers crossbreed two types of cows to produce a breed of cow that has high quality beef and can tolerate a hot climate

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question 126.6 pts
the combination of all the genes in a breeding population are referred to as:
group of answer choices

chromosomes

individuals

gene flow

gene pool

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question 136.7 pts
how do mutations influence evolution?
group of answer choices

a heritable characteristic that increases an organisms chance at surviving and reproducing in its given environment

the mutation causes more awareness and intelligence so that the organism can out compete others

a change in the dna produces a variation within the gene

creates a new body part or structure that allows for a better chance at survival

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question 146.7 pts
what is the best description for evolution?
group of answer choices

a change in a population over time

a change in an organism over time

the variation of species globally

the diversity between us and other living things

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question 156.7 pts
in order for a species to evolve, it must be able to:
group of answer choices

be domesticated

consume a large quantity of food

reproduce successfully

maintain a constant body temperature